The problems of learning physics have experienced increasingly complex obstacles amid the demands of online learning due to the COVID-19 pandemic. The purpose of this study is to explain the basic physics learning process through an online system during a pandemic, by evaluating the Self-Regulated Learning (SRL) approach to Problem-solving Skills (PSS). Data were collected through distributing questionnaires, interviews and documentation studies, then analyzed. This study shows that the applied SRL has been implemented well, but has not been optimal in improving PSS in online Basic Physics learning. The unpreparedness of technological devices and the competence of educators and students become obstacles that result in difficulties in solving physics problems so that the expected results are not following the expected learning targets. Also, this study shows the difficulty of learning physics online during the pandemic. Thus, a responsive physics learning model is needed with conditions that allow the delivery of physics material to be well understood, even though it is delivered through digital media. This is a demand that needs the attention of all parties so that the achievement of online learning targets remains optimal and effective in increasing the problem-solving skills of students during the COVID-19 pandemic.
This research describing the role of the mother that very central in assisting children’s learning activities through the concept of mentoring that focuses on the uniqueness of each individual. This concept is termed a Learning- Centered Individuals who see uniquely child has potential, interests and dy- namics of each problem, so that the practical assistance should be focused on managing the potential and uniqueness of each individual dynamics prob- lems to deliver the right learning attitude, without forgetting the reaching academic achievement.<br /><br />Keywords: Ibu, pendampingan, belajar, Individual Learning-Centered
Science, technology, engineering, arts, and mathematics (STEAM) have been applied in various countries because they have been able to answer the challenges of the globalization era. The implementation of STEAM at school has demanded that teachers have a role in making a relationship between disciplines in science contained in STEAM. The purpose of this research was to describe the perceptions of experienced teachers about math-focused STEAM learning. The research was a descriptive study on 14 vocational high school mathematics teachers in Malang, Indonesia. They had 20-30 years of teaching experience. Data were collected using essay questionnaires. The result showed that their perceptions of STEAM learning were positive. However, they also said that there were several obstacles to math-focused STEAM learning. The first obstacle was the unavailability of supporting literature. The second obstacle was that there were teachers who have no received training. The third obstacle was only a limited number of mathematics material that can be applied in STEAM learning. Additionally, the teacher stated that mathematics was more suitable as supporting contain in STEAM learning than as the primary focus.
ABSTRAK: Salah satu alternatif dalam mendukung ketersediaan sumber daya energi terbarukan adalah dengan memanfaatkan sumber dari non fosil seperti bioetanol. Bioetanol merupakan etanol yang dibuat dari biomass yang mengandung komponen pati (karbohidrat) atau selulosa yang selanjutnya di fermentasi menggunakan bantuan mikroorganisme (Sacharomyces cerevisiae). Karbohidrat yang digunakan pada penelitian ini berasal dari Lemna minor (Duckweed). Penelitian ini bertujuan membuat bioetanol dari Lemna minor dengan variasi penambahan ragi dan lamanya waktu fermentasi. Kemudian bioetanol ini ditentukan kadar etanol dan densitasnya serta mengetahui hubungan antara keduanya. Produksi bioetanol telah dilakukan melalui proses konversi karbohidrat menjadi gula (glukosa) dengan hidrolisis asam (HCl).Hidrolisat yang diperoleh selanjutnya dilakukan fermentasi dengan menambahkan yeast atau ragi sehingga diperoleh bioetanol. Variabel yang digunakan adalah perubahan massa ragi 5%,15%, dan 25% serta lama fermentasi 5, 6, dan 7 hari . Hasil penelitian menunjukkan lama fermentasi dan persentase ragi mempengaruhi kadar etanol. Nilai kadar etanol optimum diperoleh presentase ragi 25% dengan lama fermentasi 7 hari sebesar 3.81% dengan density optimum sebesar 0.9438 gr/cm 3, Hubungan nilai densitas berbanding terbalik dengan peningkatan kadar etanol.Kata kunci: Persentase ragi; waktu fermentasi; Lemna minor. ABSTRACT:One alternative in favor of the availability of renewable energy resources is to utilize non-fossil sources such as bioethanol. Bioethanol is ethanol made from biomass component containing starch (carbohydrate) or cellulose. Furthermer it is fermented using microorganisms (Sacharomyces cerevisiae). In this study Lemna minor (Duckweed) was used to produce carbohydrates . This study aims is to make bioethanol from Lemna Minor with percentage of yeast and length of fermentation time in variation. It is then determined the ethanol value, density and the relation between them. Bioethanol production was conducted through the process of converting carbohydrates into sugar (glucose) by acid hydrolysis (HCl). Hydrolysates were then fermented by adding yeast to obtain bioethanol. The used variables were yeast mass 5%, 15%, and 25% and fermentation time 5, 6, and 7 days. The results pointed out that the percentage of yeast and fermentation time affect the levels of ethanol. The optimum ethanol value obtained by 25% ethanol with 7 days fermentation lenght was 3.81%. While optimum density was 0.9438 g / cm 3. The relation between ethanol value and density are inversely proportional.
Background: Treatment of wounds in diabetes often gets less than perfect healing. One of the reasons for the difficulty in treating wounds in diabetes is the growth of aerobic and anaerobic bacteria. This study aims to determine the pulse voltage and treatment time that can optimally inactivate bacteria, and their effect on wound healing in mice suffering from diabetes. Methods: The study used electrical stimulation with a direct voltage of 10 volts given a pulse voltage of 50-80 volts, a width of 50 µs, and the number of pulses of 65 per second. The research samples were Staphylococcus aureus (S. aureus) and Pseudo-monas aeruginosa (P. aeruginosa) bacteria that grew on beef and mice (Mus musculus) with diabetes. The treatment for S. aureus and P. aeruginosa bacteria was carried out using a pulse voltage of 50-80 volts for 5-15 min/day and repeated for 3 days. Meanwhile, treatment of mice wounds was carried out with a pulse voltage of 80 volts for 15 min/day and repeated for 7 days. Results: The results showed that treatment with a pulse voltage of 50-80 volts and a treatment time of 5-15 min significantly reduced the number of S. aureus and P. aeruginosa bacteria in beef (p£0.05). Treatment with a pulse voltage of 80 volts for 15 min made beef free from bacteria. Meanwhile, treatment with a pulse voltage of 80 volts for 15 min per day for seven days resulted in the wound state of three mice in the maturation phase and two mice in the proliferation phase on day 8 with an average wound area of 0.108 cm 2. Conclusion: The treatment with a pulse voltage of 80 volts for 15 min made the beef sterile, the mice wounds healed quickly, and the mice not stressed. The higher the blood glucose level, the slower the wound healing process.
Binahong leaf (Anredera cordifolia (Ten.) Steenis) is part of a drugs plants potency that can cure many kind of illnes include as drug anticancer. This risset have whit the goal for: (1) To know toxicity level of each extract binahong leaf (Anredera cordifolia (Ten) Steenis) in each solvent n-hexane, ethyl acetate and ethanol for level mortality larva shrimp Artemia salina Leach. (2) To Know a level of compounds that there are into extract binahong leaf (Anredera cordifolia (Ten) Steenis) with the best toxicity.The rissed have done by extracting sample with solvent n-hexane by next wiht solvent ethyl acetate and ethanol. Concentrated extract that got in used to exam toxicity for shrimp larva BSLT and phytochemical test reagent. Mortality artemia salina by with probit analysis to know value of LC 50 .The result from this risset show on each extract binahong leaf (Anredera cordifiola (Ten) Steenis) have level of toxicity on shrimp larva Artemia salina Leach, show with value LC 50 <1000 ppm. The level of toxicity extract ethanol, extract ethyl acetate and n-hexane extract is an value LC 50 a lot 7.35702 ppm, 106.992 ppm and 175.800 ppm. Into ethanol extract have done phytochemical test reagent there are leve alkaloids, flavonoids, tannins, triterpenoin/steroids and saponins. Lavel of that compounds show there are potency bioactivity on shrimp larva Artemia salina Leach.Keyword: Anredera cordifiola (Ten) Steenis, Artemia salina Leach, Toxicity Test and BSLT. ABSTRAKDaun binahong (Anredera cordifolia (Ten.) Steenis) adalah bagian dari tanaman obat potensial yang dapat mengatasi berbagai jenis penyakit termasuk sebagai obat antikanker. Penelitian ini dilakukan dengan tujuan untuk: (1) Mengetahui tingkat toksisitas masing-masing ekstrak daun binahong (Anredera cordifolia (Ten) Steenis) dalam tiap pelarut n-heksana, etil asetat dan etanol terhadap tingkat mortalitas larva udang Artemia salina Leach. (2) Mengetahui golongan senyawa yang terdapat dalam ekstrak daun binahong (Anredera cordifolia (Ten) Steenis) dengan toksisitas yang terbaik.Penelitian dilakukan dengan mengekstraksi sampel dengan pelarut n-heksana yang dilanjutkan dengan pelarut etil asetat dan etanol. Ekstrak pekat yang diperoleh digunakan untuk uji toksisitas terhadap larva udang BSLT dan uji fitokimia dengan reagen. Data kematian Artemia salina dianalisis dengan analisis probit untuk mengetahui nilai LC 50 . Hasil dari penelitian menunjukkan pada masing-masing ekstrak daun binahong (Anredera cordifiola (Ten) Steenis) memiliki tingkat toksisitas terhadap larva udang Artemia salina Leach, ditunjukkan dengan nilai LC 50 < 1000 ppm. Tingkat toksisitas ekstrak etanol, ekstrak etil asetat dan ekstrak n-heksana yaitu dengan nilai LC 50 sebesar 7,35702 ppm, 106,992 ppm dan 175,800 ppm. Pada ekstrak etanol dilakukan uji fitokimia denga reagen yaitu adanya golongan senyawa alkaloid, flavonoid, tanin, triterpenoid/steroid dan saponin. Golongan senyawasenyawa tersebut yang menunjukkan adanya potensi bioaktivitas terhadap larva udang Artemia salina Leach.
COVID-19 pandemic has changed the learning system in Indonesia. Learning that is usually carried out face-to-face must be changed to online learning. The fact is online learning is not running as expected. This research aims to describe learning during the COVID-19 pandemic by examining elements of learning targets, analyzing needs, obstacles, and solutions. This type of research is a case study using literature studies in the form of articles and field studies to see the learning process during the pandemic. The subjects in this study were principals, physics teachers, and students spread across four schools in Mataram, West Nusa Tenggara. Data collection was carried out by interview and observation. The results showed that the learning target does not have to match the target achievement of the 2013 curriculum. Learning focuses more on providing experiences to students. During the pandemic, learning obstacles are 1) limited mastery of technology, 2) limited internet access and wasteful data packages, and 3) less interaction. The solution given by several schools is by using video lessons and face-to-face learning using small groups.
ABSTRAK:Penelitian ini bertujuan untuk mengetahui pengaruh penambahan air dan perubahan kadar glukosa pada biomassa bonggol pisang melalui paparan radiasi matahari, gelombang mikro, dan hidrolisis asam. Metode penelitian dilakukan dengan cara mengeringkan bonggol pisang jenis pisang kepok selama 5 hari, kemudian dihomogenkan dengan proses penghalusan, setelah itu dilakukan tiga metode penghidrolisisan pati menjadi glukosa melalui paparan radiasi matahari, paparan gelombang mikro, dan hidrolisis asam. Pada setiap perlakuan pemaparan, sampel divariasi menjadi tiga yaitu kering, penambahan air 10 ml, dan penambahan air 20 ml, masing-masing perlakuan dilakukan pengulangan sebanyak 3 (tiga) kali. Kadar glukosa dianalisis dengan metode Nelson-Somogyi dan hasilnya dianalisis menggunakan perbandingan grafik. Berdasarkan hasil penelitian, menunjukkan adanya pengaruh penambahan air dan metode yang digunakan terhadap kadar glukosa. Hasil analisis UV-Vis melalui analisis perbandingan grafik menunjukkan bahwa terdapat peningkatan kadar glukosa yang signifikan terutama ketika sampel dipapar menggunakan gelombang mikro serta dengan penambahan air 20 ml yang menghasilkan kadar glukosa sebesar 30.89%. Sumber energi biomassa dapat berasal dari tanaman perkebunan atau pertanian, hutan, atau bahkan limbah, baik limbah domestik maupun limbah pertanian. Biomassa merupakan bentuk sumber energi yang menarik untuk dikembangkan karena kelimpahannya di muka bumi dan sifatnya yang dapat diperbarui. Biomassa dapat digunakan untuk sumber energi langsung maupun dikonversi menjadi bahan bakar. Penggunaan biomassa sebagai sumber energi ini tidak akan menyebabkan terjadinya penumpukan gas CO 2 karena gas CO
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